I have just completed my first campaign as the Germans, and going to start a British one sooh.
Tips for other players:
Make sure to be spending enough money to construct/purchase more transport ships, a lot of the players complaining about transport losses tanking their economy are not keeping their transports at 100%. You can go higher but it's not clear if there's much of a benefit for doing so, I had 160% capacity at one point.
Try and put ships at ports closer to your enemy, mostly the North Sea ports for both sides, as ships in ports further away don't seem to help too much unless you're already losing in the North Sea anyways.
Always be building dock space, smaller increments are generally better because you gain no cost or time savings for making larger upgrades at once, so improving by 500 tons immediately gives you the benefit of 500 tons in 6 months while if you built 1,000 tons you won't get any benefit of it until 12 months elapse.
Have some of your non-BB ships be heavily focused on speed incase the ships are part of a convoy raid or defense. Being able to zip into the convoys to protect/attack them before they get destroyed/reinforced, is great.
My German campaign lasted ~5 years (Manual resolving most battles), don't waste research priority on something that will take a stupidly long time, especially considering research priorities slow down all other researches, including other research priorities.
Auto resolving a battle is better than skipping it, as damage during auto resolve is *generally* not that critical and the victory point loss of skipping it can be very high. It isn't uncommon to see a cruiser duel result in light damage for both sides and ~15 or so VPs per side.
Skipping convoy raids (but not convoy defenses) has no impact on VP. Sometimes the enemy will have half their fleet protecting their convoys against a couple of your CLs, just skip it.
Crew training is currently bugged and lets you train crews to veteran, take advantage of it for now until it's fixed, the AI Will and you'll be sending Cadet crews against their veterans otherwise.
Hope this helps!